1. The price reported in Column 4 is a weighted average price. The reporting person undertakes to provide KEG, any security holder of KEG, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth above.

2. Includes 9,800,630 shares issued to Soter Capital, LLC ("Soter) in connection with issuer's emergence from bankruptcy on December 15, 2016 and Soter's participation in the related rights offering.

3. Soter Capital Holdings, LLC ("SCH") is the sole member of Soter and may be deemed to beneficially own the common stock beneficially owned by Soter. PE Soter Holdings, LLC ("PESH") holds a majority membership interest in SCH and may be deemed to beneficially own the common stock beneficially owned by SCH. Platinum Equity Capital Soter Partners, L.P. ("PECSP") holds a majority membership interest in PESH and may be deemed to beneficially own the common stock beneficially owned by PESH. Platinum Equity Partners III, LLC ("PEP III") is the general partner of PECSP and may be deemed to beneficially own the common stock beneficially owned by PECSP.

4. (Continued from Footnote 3) Platinum Equity Investment Holdings III, LLC ("PEIH III") is the senior managing member of PEP III and may be deemed to beneficially own the common stock beneficially owned by PEP III. Platinum Equity InvestCo, L.P. ("PEI LP") owns all of the economic interests in PEIH III and may be deemed to beneficially own the common stock beneficially owned by PEIH III. Platinum Equity Investment Holdings IC (Cayman), LLC ("PEIH IC LLC") is the general partner of PEI LP and may be deemed to beneficially own the common stock beneficially owned by PEI LP. Platinum InvestCo (Cayman), LLC ("PIC LLC") holds a controlling interest in PEI LP and may be deemed to beneficially own common stock beneficially owned by PEI LP.

5. (Continued from Footnote 4) Platinum Equity Investment Holdings, LLC ("PEIH LLC") is the sole member of PEIH IC LLC and may be deemed to beneficially own the common stock beneficially owned by PEIH IC LLC. Platinum Equity Investment Holdings III Manager, LLC ("PEIH III Manager") is the sole manager of PEIH III and may be deemed to beneficially own the common stock beneficially owned by PEIH III. Platinum Equity, LLC ("Platinum Equity") is the sole member of PEIH III Manager and PEIH LLC and may be deemed to beneficially own the common stock beneficially owned by each of PEIH III Manager and PEIH LLC. Platinum Equity and Tom Gores, together, hold a controlling interest in PIC LLC and may be deemed to beneficially own the common stock beneficially owned by PIC LLC.

6. (Continued from Footnote 5) Tom Gores is the Chairman and Chief Executive Officer of Platinum Equity and may be deemed to beneficially own the common stock beneficially owned by Platinum Equity. Mr. Gores disclaims beneficial ownership of all the shares of common stock held by each of the entities listed above with respect to which he does not have a pecuniary interest.